51020699 has 4 divisors (see below), whose sum is σ = 52666560. Its totient is φ = 49374840.

The previous prime is 51020677. The next prime is 51020731. The reversal of 51020699 is 99602015.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51020699 - 2⁸ = 51020443 is a prime.

It is a super-2 number, since 2×51020699² = 5206223452897202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51020399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 822884 + ... + 822945.

It is an arithmetic number, because the mean of its divisors is an integer number (13166640).

Almost surely, 2^51020699 is an apocalyptic number.

51020699 is a deficient number, since it is larger than the sum of its proper divisors (1645861).

51020699 is a wasteful number, since it uses less digits than its factorization.

51020699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1645860.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 51020699 is about 7142.8775013996. The cubic root of 51020699 is about 370.8931405902.

The spelling of 51020699 in words is "fifty-one million, twenty thousand, six hundred ninety-nine".